OI-7530 Explosion Proof Relayer with 3 Relays


The Gen II WireFree Relayer OI-7530 is a wireless relay/alarm system specifically designed for use in conjunction with the Otis Instruments, Inc. Gen II WireFree Product Line.

The OI-7530 features 3 relays and 3 LEDs, and can monitor up to 32 sensor assemblies via transmissions from an on-board 900MHz or 2.4GHz radio.

The ability to mount the OI-7530 near the entrance of a site allows the technician to immediately determine if it is safe to enter the site, making this device incredibly useful in any environment hosting hazardous gas.  The OI-7530 can be mounted as a traditional or self-contained system that requires 12-35 Volts DC or 120-240 Volts AC.

These key features-and more-make the Gen II WireFree Relayer OI-7530 a reliable and convenient tool that is incredibly useful in any environment hosting hazardous gas.

Part Number Formula: OI-7530-[Radio Frequency]-[Power Supply]-A





Supply Voltage: 12-35 VDC or 120/240 VAC

Current Draw: 275mA at 24 VDC (monitor only); 6.6 Watts Max

Temperature: -30 to 70° C

Channels: 32 channels


  • Three dry-contact with 4 Amp fuses

  • Three individually configurable set-points

Radio Options:

  • 2.4 GHz ISM, 100mW

  • 900 MHz, 200mW

RF Connection: Class I, Div. 1; External N Female connector

Enclosure: Explosion-proof Class I, Div. 1

Warranty: Hardware: One year (Limited)


OI-7530 Data Sheet

OI-7530 Operation Manual


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Part NumberDescription
OI-LCD-128LCD Screen with Green LED Backlight
OI-7530-FP-KITOI-7530 Faceplate Kit with Faceplate, Label, (2) Handles, Screen Foam
OI-7530-PCAOI-7530 Control Board Assembly, includes LCD Screen
OI-432-UFL-4u.FL Cable for Connecting Radio Module to Board
OI-WF690-AF-NAntenna Fitting, Class 1, Div 1, N Female
OI-RADIO-2.4-THGEN II 2.4 GHz Radio Module
OI-RADIO-900-LAIRDGEN II 900 MHz Radio Module
OI-AN-2.4-RIGID-S2.4 GHz Antenna, Non-Flexible, Straight
OI-AN-900-FLEX-S900 MHz Antenna, Flexible, Straight
OI-PMC-24V075W1AAReplacement 24VDC/3.125A Power Supply
OI-WF753-PS-BRKTOI-7530 Power Supply Mounting Bracket Kit
OI-420-10Otis Magnet, 10 Lbs
OI-402-5PACKPackage of 5 Desiccant Bags, 6 Grams per Bag
OI-FUSE-4A-250Fuse 4A, 250V Slow Blow

Additional information

Radio Configuration

Gen II 900 MHz Radio, Gen II 2.4 GHz Radio



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